The invention provides an image forming device. The image forming device comprises a photoreceptor, a developing roll, a transfer roll and a charging device, wherein after the surface of the photoreceptor is charged, an electrostatic latent image is formed on the surface of the photoreceptor through exposure; through the developing roll, the electrostatic latent image is developed into a toner image by transferring the toner onto the photoreceptor, the toner has the same polarity as the charging polarity on the surface of the photoreceptor; the toner image is transferred onto a recording medium through the transfer roll; the developing roll and the transfer roll are electrified through the charging device; voltage opposite to the polarity of the toner is applied onto the developing roll and the transfer roll through the charging device before the developing roll drives. The invention also provides a method for cleaning a transfer component in the image forming device.